时间:2019-01-14 作者:英语课 分类:VOA标准英语2016年(六月)


英语课

全息图或可与CT及超生扫描仪兼容


Since the 1980s, doctors have used Magnetic Resonance 1 Imaging machines, or MRI scanners, to look into patients’ bodies without exposing them to the harmful effects of X-rays.An alternating magnetic field created inside the MRI's tube excites hydrogen atoms in the body’s tissues, making them emit radio waves. Those waves can be turned into pictures, similar to X-ray images. The magnet of a new MRI, built by Siemens, has 7 tesla units, making it more than 100,000 (7/0.000065 = 107,692) times more powerful than the earth’s magnetic field. “Using something like 7-tesla imaging, you can do very high resolution imaging, you can get the contrast that you need in order to identify the particular sub-parts of the nuclei 2 that you need, but even high-resolution two-dimensional black-and-white pictures are quite different from three-dimensional color renditions that can be viewed from all angles.Using MRI-generated images of water molecules 3 moving within the brain’s white matter, scientists at the British company Holoxica created a hologram showing the connections between neurons. “The brain is such a complex three-dimensional structure, and sometimes it is quite difficult to describe, or understand, the actual connections.So to see it in 3-D, that may be a short cut to education, and it can reinforce the learning process.”The holographic display is still in prototype phase, but researchers say, once ready for production, it will be compatible not only with MRI machines but also with CT and ultrasound scanners.


自上世纪80年代以来,医生一直使用磁共振成像机器,也就是磁共振扫描仪,来观察患者身体,使患者不必因暴露于X光下而受到伤害。在磁共振扫描仪管道内部产生的交互式磁场会激发人体组织内的氢原子,使氢原子发射出无线电波。这些无线电波的图像近似于X光线的图像。西门子研发的磁共振扫描仪有7特斯拉单元的磁通量,使扫描仪磁场为地球磁场的10万多倍。 “有了7特斯拉的成像技术,就可以做高清成像,就可以得到清晰的对比,从而确定原子核的不同部分。不过,即便是高清的二维黑白图像,也和三维的彩色图像不同,因为后者可以从不同角度观察。


通过使用磁共振扫描仪展示的关于水分子在大脑白质中移动的图像,英国公司Holoxica的科学家发明了一个全息图,可以展示神经元之间的关系。“大脑是极其复杂的三维结构,有时很难描述或理解其中的关系。所以,以三维的方式来观察大脑,对教育来说可能是一个捷径,可以加强学生的学习过程。”虽然全息显示尚处于初期阶段,但专家称,一旦投入生产,不仅与磁共振扫描仪兼容,也能与电脑断层扫描机(CT)和超声扫描仪兼容。



n.洪亮;共鸣;共振
  • Playing the piano sets up resonance in those glass ornaments.一弹钢琴那些玻璃饰物就会产生共振。
  • The areas under the two resonance envelopes are unequal.两个共振峰下面的面积是不相等的。
n.核
  • To free electrons, something has to make them whirl fast enough to break away from their nuclei. 为了释放电子,必须使电子高速旋转而足以摆脱原子核的束缚。
  • Energy is released by the fission of atomic nuclei. 能量是由原子核分裂释放出来的。
分子( molecule的名词复数 )
  • The structure of molecules can be seen under an electron microscope. 分子的结构可在电子显微镜下观察到。
  • Inside the reactor the large molecules are cracked into smaller molecules. 在反应堆里,大分子裂变为小分子。
学英语单词
a thin line
air chilling
aleurite
americanisation
amplitude test cassette
analysis of resistance
anchusa italica reta.
arfon
artesian flow area
associative ligand exchange mechanism
attrites
axisymmetric torus
be under investigation
biopsychiatry
black square
brail line
braking ratio
Caribbean Netherlands
carry-on baggage
center of floatation
Chiglish
chondroblastomata
church-baseds
conoscopic
cuckoo-flower
current capacity
data speed
dehydrogenases
displace angle
elbow cover opener
electrolytically deposited black
emir
enterokinesia
entrenches
epitrichocutis
euglobulins
Ex-drinker
figure of eights
forced savings
full employment policy
genus Tacca
glycosphingolipid
Guātala
gyrotraverse mechanism
have something on sb
heaviside layers
hindereth
Honda steel
Idaho Falls
impression construction
inertinitic
insulating oil flash point
jejuno-ileal lymph gland
Kakhtana
kesks
lacrymotome
lega
Lydick
Mablethorpe
macking it
Melicope semecarpifolia
middle troposphere
MRP (main reactor pump)
Muk, Ko
myo(sino)gen
natali
newsmaster
noisy input signal
Obrenovac
out of the bottom drawer
Paltauf's modification of Gram's stain
panaritium analgicum
panchromatic negative
paratendipus nigrofasciatus
pedate leaf
peripheral module
pick the winner
posterior pituitaries
price aggregate
psychologic operator
QEW
reduced form of general game
run-away regeneration
sargassoes
Scano di Montiferro
sex characters
silica gel column chromatography
solventogenic
spiritual accessory
spraying nipple
Strobilanthes cusia
stupidoes
sulfo-chlorinated lubricant
television transmission network
theca external
thermodynamic
tractor-drawn scraper
Uta, Pulau
voice activity detection
wine-bibbings
Zhetysay
zu'ama